Sealing-cap



R. E BRUNS.

SEALING CAP.

APPLICATION FILED mm. 4, 1918.

31 D 1 Q Q Patented J 13 MEG O UNITED STATES PATENT OFFICE.

RICHARD E. BBUNS, OF CHICAGO, ILLINOIS.

SEALING-CAP.

Application filed March 4, 1918. Serial No. 220.142.

and particularly bottles containing catsup,

chilli sauce and the like, include a cork of substantial size which is forced into the neck of the bottle together with a screwcap for closing the top of the bottle after the cork-has been removed. This is a relatively expensive construction and efforts have been made to avoid the use of the straight cork by providing a sealing disk located in the screw-cap. This has been unsuccessful for several reasons, the principal one of which is that if the top of the bottle is rough or uneven, the grmding effect caused by the rotation of the cap during the sealing process results in the detachment of particles of cork which find their way into the contents of the bottle. This is particularly true,where composition cork disks are employed.

An advantage of the construction herein illustrated is in that l eliminate the necessity for a large straight cork in the choke of the bottle there being substituted there'- for a sealing member of relatively small size adapted to be secured to a disk separable from but held in proper relationv in the screw-cap. A further advantage of this arrangement is that the metallic disk which carries the cork or composition sealing member is )rovided with a portion which overlies and interfits with the extremity of the bottle, the cork sealing member being so disposed with relation to the metallic disk that its periphery is deflected and forced into the choke of the bottle there be.- ing simultaneously formed metallic and non-metallic seals, the former acting on the top edge of the bottle and the latter on the curved, inner edge of the opening.

A further advantage arising from this construction is that as the metallic disk is deflected to form an annular groove which engages the to of the bottle, the annular rib resulting rom the formation of the groove is adapted to lie against the end wall of the screw-cap, whereby the force exerted by the screw-cap is transmitted directly 1n line with the point at which the seal is to be made. For this reason metal of a thinner section may be employed than if the force exerted by the screw-cap on the sealing disk is transmitted to the bottle at a point removed from the point of application as when the sealing disk is provided with a central projection adapted to be contacted by the screw-cap.

In practice, the portion of the sealing d1sk outside of the portion occupied by the sealm member as well as that portion underneat the sealing disk is coated with lacquer. After the container has been l Specification ct Letters Patent. Patented July 13, 1920. i

closed andduring the pasteurizing process the lacquer is fused and upon cooling the cork or composition sealing member will tightly adhere to the metal of the disk. Furthermore, the lacquer will assist in sealmg the metal disk to the extremity of the glass container.

The invention will be more readily un derstood by reference to the accompanying drawings, .wherein,-

Figure 1 is an elevation, partly in section, showing my improved device applied to a bottle of common form;

Fig. 2 is an elevation of the cap;

Fig. 3 is a sectional view through the sealing disk, and,

Fig. 4: is a bottom plan view thereof. In the drawings it will be seen that the bottle 10, is provided with threads 11, the extremity or open end of the neck of the bottle being curved or rounded, as at 12, in the usual manner. A screw-cap 13, is employed, the same being preferably of the type in which the threads 14:, are rolled or stamped therein, after which the sheet is formed into a cylinder by joining the ends.

This results in the formation of a seam or Hill whichta groove 19, is pressed, the bottom and one side 20, of the groove being shaped to conform as accurately as possible to the contour of the end or top edge of the bottle, the inner ortion 21, of the groove being either stralght or curved in the arc of a much larger circle than the portion 20. The reason for this will appear from the following description. I

Acork, rubber or composition disk 22, 1s secured to the metallic disk at a central oint by means of glue or similar adhesive. referably, the adhesive is applied only to such 'portion of the area of the disk as is indicated by the heavy line 23, in Fig. 3, the outer portion of the disk being free therefrom. The periphery 26, of the metallic disk is bent downwardly as shown, and the edge of the cork disk or sealing member extends a certain distance into the groove 19, lying alongside the straight portion 21,thereof. Before'application to a bottle a space v separates the extreme peripheral portion of the cork disk from the metallic disk. However, when the device is applied to a bottle, as shown in Fig. 1, the cork disk is forced into the choke of the bottle, the free portion of the cork sealing member conforming to the shape of the bottle and being fitted" screw-cap, a metallic disk located in the upper end of said cap, said disk bein' provided with an annular. groove shape to conform to the extremity of the bottle,

the groove being formed by upsetting the metal thereby providing a rib adapted to contact the end wall ofthe cap, and a nonmetallic sealing disk secured to said metallic disk and adapted to be forced into the open end of the bottle, the parts being so arranged that the groove engages the extremity of the bottle as the non-metallic disk is seatedin the open end thereof, substantially as described.

2. A closure for bottles having screwthreads, comprising in combination, a screw-cap, a separate disk located in said cap, said disk being pressed to form an annular groove, one wall of the groove bean annular groove, a substantial portion of contact with the upper edge of the bottle and as the force of'the screw cap is applied directly on the rib formed by pressing out the groove 19, the metallic disk is caused to conform to any slight irregularities in the shape of the bottle, which may have been caused by annealing. It will be noted that the sealing disk is-tap'ered downwardly in order to provide a relatively thin edge adapted to conform to the contour of the bottle without difficulty.

Referring to Fig. 1, it will be seen that a space 25, is left between the lower down turned'edge 26, of the metallic disk and 'the shoulder 27, formed by pressing out the rib 16. This serves to permit any expansion or distortion which may take place in the metallic disk following its conformation to the shape of the bottle head.

Not only does the rib formed by upsetting the metal serve the purpose heretofore described, but in addition it serves to reduce the area of contact with the screw-cap and thereby to reduce friction. The rib, together with the depending flange .26, has the further function of stifi'ening or strengthening the sealing disk.

Such modifications as will occur to those J skilled in the art I consider to be within the 1. A closure for bottles having screvvthreads, comprising in combination. a'

the groove being shaped to conform to the contour of the extremity of the bottle, and

a tapered non-metallic sealing disk asso- 5. Sealing means for screw-top bottles comprising in combination a'screw-cap, the top wall of wh1ch- 1s crimpedinto engagement with the side walls, and a separate seallng device loosely held in the upper end of said cap, said sealin device comprising metallic, and non-meta ic disks both of which are ada ted to engage the bottle, sub-' stantially as described.

6. In means for sealing screw-top containers, the combination of a screw-ca formed with an annular recess in one en the side and end walls of the cap being separate and crimped into en agement with each. other and a sealin evice permanently held with-its perip cry in said annular recess, said sealing device comprising metallic and non-metallic disks, the former being provided With an annular groove shaped to fit over the extremity of the bottle and the latter being shaped to fit into the choke of the bottle, substantially as described.

'7. 1n means for sealing screw-top containers, the combination of a screw-cap having an end wall, a sealing device comprising metallic and non-metallic disks, said metallic disk being pressed to form a rib engaging said end Wall, said rib being so shaped that the groove resulting therefrom conforms to the contour of the extremity of the container, said non-metallic disk being of such size that its periphery projects into a portion of the groove formed by pressing out said rib, said non-metallic disk being adapted to closely fit the choke of the bottie, substantially as described.

8. Sealing means for screw-top bottles comprising in combination a screw-cap, the top Wall of which is crimped into engagement with the side Walls, and a separate sealing device loosely held in the upper end of said cap, said sealing device comprising a metallic disk adapted tremity of the bottle, and a non-metallic disk adapted to enter the choke of the bot tle, substantially as described.

Signed at Chicago, 111., this 27th day of February, 1918.

RICHARD E. BRUNS.

Witness T. D. Burma.

to overlie the ex- 

